> ## Documentation Index
> Fetch the complete documentation index at: https://prod-mint.classiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Negation

<Card title="View on GitHub" icon="github" href="https://github.com/Classiq/classiq-library/blob/main/functions/function_usage_examples/arithmetic/negation/negation_example.ipynb">
  Open this notebook in GitHub to run it yourself
</Card>

The negation operation receives a quantum register representing some number $x$
and returns a quantum register containing $-x$.

Integer and fixed point numbers are both supported.

## Example

The following example will show negation of a signed quantum variable.

```python theme={null}
from classiq import *


@qfunc
def main(a: Output[QNum], b: Output[QNum]) -> None:
    allocate(3, SIGNED, 0, a)
    hadamard_transform(a)
    b |= -a


qmod = create_model(main)
```

```python theme={null}

qprog = synthesize(qmod)

result = execute(qprog).result_value()
result.parsed_counts
```

<Info>
  **Output:**

  ```
  [{'a': 0.0, 'b': 0.0}: 143,
     {'a': -2.0, 'b': 2.0}: 136,
     {'a': -1.0, 'b': 1.0}: 130,
     {'a': 1.0, 'b': -1.0}: 122,
     {'a': 2.0, 'b': -2.0}: 121,
     {'a': 3.0, 'b': -3.0}: 120,
     {'a': -4.0, 'b': 4.0}: 114,
     {'a': -3.0, 'b': 3.0}: 114]
    

  ```
</Info>